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Method for preparing carbon nano-tube modified polyaniline nano fiber composite material

A carbon nanotube modification and nanofiber technology, which is applied to conductive materials dispersed in non-conductive inorganic materials, can solve the problems of reduced electrochemical performance of composite materials, and achieve excellent electrochemical performance, easy control, and high conductivity. high effect

Inactive Publication Date: 2008-08-06
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the polyaniline / carbon nanotube composite material prepared by the above method has high electrical conductivity, due to the high content of the electrochemically inert substance-carbon nanotube in this type of composite material, the electrochemical performance of the composite material is too high. reduce

Method used

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  • Method for preparing carbon nano-tube modified polyaniline nano fiber composite material
  • Method for preparing carbon nano-tube modified polyaniline nano fiber composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Put a certain amount of multi-walled carbon nanotubes into 98% concentrated H 2 SO 4 and 63% concentrated HNO 3 (volume ratio: H 2 SO 4 : HNO 3 =3:1) in a mixed acid, heated at 60° C. for 6 hours, then repeatedly washed with deionized water until neutral, and dried to obtain acid-treated multi-walled carbon nanotubes. Weigh 0.14g of acid-treated multi-walled carbon nanotubes and add them to 100mL of 1.5mol / L perchloric acid aqueous solution, ultrasonically disperse for 2 hours; then add 4.47g (48mmol) of aniline monomer into the above mixing system, stir and mix for 0.5 Hour. Then weigh 2.75g (12mmol) ammonium persulfate and dissolve it in 50mL of 1.5mol / L perchloric acid aqueous solution, slowly add the ammonium persulfate solution dropwise to the above solution, and stir and react at room temperature for 24 hours. The product is filtered, washed and dried to obtain a doped polyaniline / multi-walled carbon nanotube composite material. The above-mentioned doped st...

Embodiment 2

[0032] The process of Example 1 was repeated to prepare acid-treated multi-walled carbon nanotubes. Weigh 0.75g of acid-treated multi-walled carbon nanotubes into 50mL of 1mol / L perchloric acid aqueous solution, and ultrasonically disperse for 4 hours; then add 4.47g (48mmol) of aniline monomer into the above mixing system, and stir and mix for 1 hour . Then weigh 5.5g (24mmol) of ammonium persulfate and dissolve it in 50mL of 1mol / L perchloric acid solution, slowly add the ammonium persulfate solution dropwise to the above solution, and stir and react at room temperature for 12 hours. The product is filtered, washed and dried to obtain a doped polyaniline / multi-walled carbon nanotube composite material. The above-mentioned doped state polymerization product was dispersed in 10 wt% ammonia water and stirred for 24 hours to obtain a dedoped multi-walled carbon nanotube-modified polyaniline composite material.

[0033]Transmission electron micrographs show that the polyaniline...

Embodiment 3

[0036] Repeat the process of Example 1, with 69% concentrated HNO 3 Instead of 63% concentrated HNO 3 , the treatment time is 24h, and acid-treated multi-walled carbon nanotubes are prepared. Weigh 0.28g of acid-treated multi-walled carbon nanotubes into 100mL of 3mol / L perchloric acid aqueous solution, and ultrasonically disperse for 1 hour; then add 4.47g (48mmol) of aniline monomer into the above mixing system, and stir and mix for 1 hour . Then weigh 1.38g (6mmol) ammonium persulfate and dissolve it in 30mL of 3mol / L perchloric acid solution, slowly add the ammonium persulfate solution dropwise to the above solution, and stir and react at room temperature for 48 hours. Finally, the product is filtered, washed and dried to obtain the doped multi-walled carbon nanotube modified polyaniline composite material.

[0037] Transmission electron micrographs show that the polyaniline composite material modified by multi-walled carbon nanotubes presents a structure in which polya...

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Abstract

The invention discloses a preparation process of carbon nano-tube modification polyaniline nano fiber conductivity composite material. The characteristics of the invention are that conducting acid treatment for carbon nano-tube with concentrated mixed acid, adding carbon nano-tube which is treated with acid and aniline monomer into perchloric acid water solution according to the weight ratio of 1:6-1-32, and evenly dispersing through ultrasonic processing, using ammonium persulphate as oxidation agent, controlling the molar ratio of ammonium persulphate and aniline monomer within 1:2-1:8, and reacting under the ambient temperature to obtain polyaniline nano fiber / conductivity composite material of polyaniline coating carbon nano-tube coexisting structure. The process has simple art, and is easy to be controlled. The composite material which is prepared has the characteristics of high electricity conductivity ratio and small influence by system pH valve, large specific surface and excellent electrochemistry property and the like, which is expected to be used on electrode material such as second lithium ion cell and super capacitor and the like.

Description

technical field [0001] The invention relates to a preparation method of a polyaniline / carbon nanotube composite material, in particular to a preparation method of a carbon nanotube modified polyaniline nanofiber conductive composite material suitable for electrode materials. Background technique [0002] Polyaniline is considered to be extremely useful as an electrode material for lithium-ion batteries and supercapacitors because of its cheap and easy-to-obtain monomers, simple synthesis process, high electrical conductivity, good environmental stability, and excellent electrochemical properties. potential. However, polyaniline synthesized by traditional methods has some shortcomings such as insufficient specific capacity, and its electrical conductivity is greatly affected by the pH value of the environment, which limits its practical application. [0003] In recent years, people have prepared nanostructured polyaniline by template polymerization, template-free self-assemb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L79/02C08K9/00C08G73/02H01B1/24C08K3/04
Inventor 王庚超苏畅黄发荣李星玮
Owner EAST CHINA UNIV OF SCI & TECH
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